In a macroeconomic sense, transportation activities form a portion of a nation’s total economic product and play a role in building or strengthening a national or regional economy and as an influence in the development of land and other resources. In a microeconomic sense, transportation involves relations between firms and individual consumers. The demand for and supply of transportation for both passengers and freight, transportation pricing, and the reasons why the transportation system is both regulated and deregulated are among its concerns. ... (100 of 6,003 words)